Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b3448abf797341…

MALICIOUS

PDF

98.5 KB Created: 2021-08-20 19:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e906074e6dc6531b94c8c8c3aeff6ea8 SHA-1: 86bf04c2f6b2b779cb7fc4cfe27be980293a5ed5 SHA-256: e0b3448abf7973414062db36bd271d1a57db126c13ed0c876bd64942312c2007
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm or SEO poisoning scheme. The ML classifier strongly indicates maliciousness, and the structure points towards a potential delivery mechanism for further malicious content, possibly via JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=how+to+write+an+application+letter+applying+for+a+job+as+a+teacher PDF link annotation
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab392cbed5a---90943877541.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a369284e0ff---tororiwopinugefamevobe.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/zukikimosipitufujuxumo.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021813149463404.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/787fa67e647053f54afe5e377b7ecebe/16293332509.pdfIn PDF document text
    • http://lulanjina.net/upload/files/88567817794.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/bomunigotowikivirefapes.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/17789686280.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/84489343684.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed9e7b8b6b---gexakegitamazetoxenukomag.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/43e086f545ac6dee7915693ab2ece757/53147601743.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/175cfc8f79e82a5a848950877c7301e0/jodebanitiwemufunipofav.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9f2dac94865f475606ee5995125d1053/62558975523.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/o19jv3jsfbclbsb51dj4arrlcd/40413998463.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/fipuresonimexaxosanife.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe5bb0027c---sabelipu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7f60120059494c4e982f2482e25a589/jowufipanifepojus.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d172f65774cc344399f3c082c205a70c/lepavolaxarexakezi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001ea7514a9---29619108450.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a92cafc7180c6f9809d8e7f2ee2a1ab2/rilapibidodibibakowop.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094345ad7863---95533126767.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3578e169---vebosulexemu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 11220 bytes
SHA-256: 4b70e16414d53e587b569e1f23499b25bdad2696bbc95bbc0fa7413e9631d618
font_02_sfnt_off00014d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D06 17668 bytes
SHA-256: dd0f41766c4c6bbcba36ce44d6450fcfbf81e0ba701be4067bef695a2dfe52f4

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